Ransburg RMA Indirect A12869 - Manual (Page 80)

RMA-303 Indirect Charge - Maintenance
75 LN-9268-11.4
Figure 53: High Voltage Ring Lubrication
Figure 54: Electrode Resistance Test
CHECKING PROBES
Check atomizer voltage using the Ransburg
Test Meter Kit (76652-01 or 76652-04). Verify
that the output voltages have not varied much
from the setup standard. A drastic change in
voltage can be an early indicator of a compo-
nent or system problem. The data shown was
collected under the ideal lab conditions using
a clean atomizer and an unloaded fluid deliv-
ery system.
The following data is for use with the RMA-
303. The output voltage measured at the bell
will normally range between 91% and 97% of
the kV set point displayed at the control unit.
Typically setting for spraying is 70 kV.
High Voltage Ring Inspection
Examine entire ring for burning marks indicat-
ed by melted plastic or blackened areas
around or near where the electrodes are locat-
ed, the area where the high voltage input tube
is, and on the inner diameter of the ring.
If any area is found with the above conditions,
the ring must be replaced.
After verifying, clean all old dielectric grease
from the eight (8) protrusions on the front of
the ring and from the concentric circles at the
high voltage input protrusion.
Reapply dielectric grease (LSCH0009) to both
of these areas. The eight (8) protrusions only
require a thin film of grease. The high voltage
input area must be filled with grease allowing
no air voids. Excess grease will be squeezed
out when the input tube and high voltage cable
are installed. Wipe off all excess grease.
ELECTRODE RESISTANCE TEST
To verify that all indirect charge electrodes are
functioning, place one lead of a Yokogama
megohm meter or equivalent to the metal con-
tact at the base of the electrode and the other
end to the small metal wire at the tip of the
electrode. Refer to the "Electrode Assembly
Resistance Reading" chart in this section for
the proper resistance reading for the electrode
assembly.